One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,15,17)(11,18,13,16)(12,21,23,14)(19,24,22,20)(25,26)(27,35)(28,32)(29,31)(30,34)(33,38)(36,40)(37,39)(1,2)(3,6)(4,7)(5,8)(9,11,15,13)(10,16,17,18)(12,22,23,19)(14,20,21,24)(25,27,30,29)(26,31,34,35)(28,36,38,37)(32,39,33,40)(1,3)(2,5)(4,8)(6,7)(10,17)(12,23)(16,18)(19,22)(25,28,30,38)(26,32,34,33)(27,36,29,37)(31,39,35,40)(3,8)(5,6)(9,12,15,23)(10,14,17,21)(11,19,13,22)(16,24,18,20)(25,28)(26,33)(27,36)(29,37)(30,38)(31,40)(32,34)(35,39)(1,2)(3,5)(4,7)(6,8)(9,13,15,11)(10,18,17,16)(12,22,23,19)(14,20,21,24)(25,29,30,27)(26,31,34,35)(28,37,38,36)(32,39,33,40)(1,3)(2,6)(4,8)(5,7)(9,14)(10,12)(11,20)(13,24)(15,21)(16,22)(17,23)(18,19)(25,26)(27,31)(28,32)(29,35)(30,34)(33,38)(36,39)(37,40) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.